The research team noted whether participants' body language was bold and confident, and measured the amount of effort participants' put into the academic test.
划线部分为定语从句(省略了作宾语的which/that). 其中participants' 为错误,应作如下修改:
The research team noted whether participants' body language was bold and confident, and measured the amount of effort (that) the participants put into the academic test.
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